ARE URBAN FOXES INCREASING?
Yes and no. In a recent survey in Britain, we found more or less all urban areas now have resident foxes. To estimate current population densities, we surveyed eight such areas in 2013–15, where on average we estimated around 12 foxes per km2. Fox density appeared relatively stable in cities where they have been resident for a while, but had increased in those colonised more recently, with such changes being most marked in the north. Fox populations seem to be regulated by factors other than just supplementary food provision.
In late April or early May, fox cubs begin to come into the open. These youngsters are about 8–10 weeks old.